5.3 The Fundamental Theorem of Calculus/31

Failed to parse (syntax error): {\displaystyle \int_{0}^{\frac{\pi}{4}}\sec^{2}(t)\,dt = \tan(t)\bigg|_{0}^{\frac{\pi}{4}=\tan\left(\frac{\pi}{4}\right)-\tan(0)=1-0=1 }